50cc scooter rebuild/upgrade project 1

i have had this scooter sitting around for almost 2 years with an unknown motor problem, finely have gotten off my a*s to rebuild it, plans are a 85cc big bore kit, fix any brake problems, thenonce running a new carb jetng, exhaust and intake filter, new roler bearings and clutch. used to be able to do 50 around town and the parts are super cheep on these gy6 clones so why not have some fun with it.

Category:

Autos & Vehicles

Tags:

• 50cc scooter
• gy6
• moped
• project
• rebuild
• big bore
• 85cc
• scoot

[spinellicreations]

A stock 139qmb GY6 with gearing for the American market and stock bore is only going to do around 30 mph at wide open throttle. A very light (125 pound) driver on flat road, can expect 35 mph steady at WOT, maybe one or two mph higher depending on altitude, fuel, and carburetor adjustment. To get a 139qmb GY6 up to 50 mph with an average weight (175 pound - 200 pound) driver is going to cost a small fortune - I know this because I've done it. 102 cc (56mm piston) big block kit and $800.

[labeledsk8r45]

@spinellicreations both my peace sport 50's can get to 45 just fine with me on them (165lbs) and 50 on a slight hill.. im sure the lower sea level im at helps with denser air. correct weighting and higher octain fuel to help with cylinder detination to keep it cooler helps aswell. cool scoot you got though checked out the vids would love to see vids of it running/driveing

[TheKmk4420]

i want to see this with the big bore kit man get some more vids bro

[labeledsk8r45]

@TheKmk4420 yeah sorry about the delay in vids i have more vids but i had some big life stuff come up, the bikeruns but i blew the CDI in it... i will try to get some more vids soon as i can :/ sorry guys

[chris03101991]

I have the 2012 model.

[thedondanyal1]

Made in china ;)



[HowtoBuildThings]

People who say mopeds are "gay" to ride around on have never rode one or they can't afford one.

[MrDonkeey]

"cheap ass fun, who fucking cares" i love this video, fair play to ya, hope the project it going well :)

[Scootertuner1000]

@spinellicreations Actually I spoke about 15 hp 72cc, 40-45hp 250cc and 32hp 125 cc bikes. Not once did I mention 40 horse 50cc. Challenge still stands, actually I will broaden your chances. Find me a 4 stroke 500cc GP bike that produces more HP and more torque than a a 500cc 2 stroke GP bike from the same era 1975 to 2002. You can't there wasn't one. Why do you think that is?

[Scootertuner1000]

Actually, when I lived in England I was an engineer at Cosworth, ever heard of them?

[Scootertuner1000]

@spinellicreations A 2 stroke and a 4 stroke of the same capacity and at the same RPM, the 2 stroke will produce more HP and more torque. A CRF250 Honda (4 stroke) makes about 34hp and 21ft lbs of torque. The CR250 Honda (2 stroke) makes about 45hp and 34 ft lbs of torque. The CRF needs to spin all the way to 11,000rpm to produce it's power while the CR only has to rev to 8500rpm to produce its. So not only does the 4 stroke produce less power, but it needs to rev way higher to do it.

[Scootertuner1000]

@spinellicreations They aren't incorrect, believe me. I want whatever is going to produce the most power per CC and that is not a 4 stroke. That is why in motocross for example, 4 strokes are allowed a 100% capacity advantage over the 2 stroke competition. 1 power stroke every revolution vs 1 power stroke every 2 revolutions, of course the 2 stroke is going to produce, not only more hp but also more torque, that a 4 stroke of the same capacity. I can't make it any simpler, you're wrong.

[Scootertuner1000]

@spinellicreations Wow what a spammer. Okay.  I have one challenge for you find two 500cc GP race bikes, from the 1980s through to 2002. One of them needs to be a 4 stroke and one of them needs to be a 2 stroke. Find a 4 500cc GP bike from that time period that produces the more (actually you won't be able to do that) so at least as much HP and torque as its 2 stroke competition. If you can't do that then don't bother to reply. Honda tried for years and couldn't do it.

[spinellicreations]

@Scootertuner1000 And don't - seriouly don't - bring up 2.4L Formula 1 motors that build 800 HP. Yes, they do, I know - but that is an extremely high precision device - and to hit 1,000 HP they had to bump up to 3.0L motors, which when you break it down they're only about 20% more efficient than a standard high performance automotive engine. Heck, you get 600 out of an LS1 all day long.